Chair base



FIG. 1 is a perspective view of a first embodiment of the chair base of my new design;

FIG. 2 is a side view of a first embodiment of the chair base of my new design, as viewed from the left side of FIG. 3. A side view, as viewed from the right side of FIG. 3, would be a mirror image of FIG. 2;

FIG. 3 is a front view of a first embodiment of the chair base of my new design, as viewed from the right side of FIG. 2;

FIG. 4 is a rear view of a first embodiment of the chair base of my new design, as viewed from the left side of FIG. 2;

FIG. 5 is a top view of a first embodiment of the chair base of my new design;

FIG. 6 is a bottom view of a first embodiment of the chair base of my new design;

FIG. 7 is a perspective view of a second embodiment of the chair base of my new design;

FIG. 8 is a side view of a second embodiment of the chair base of my new design, as viewed from the left side of FIG. 9. A side view, as viewed from the right side of FIG. 9, would be a mirror image of FIG. 8;

FIG. 9 is a front view of a second embodiment of the chair base of my new design, as viewed from the right side of FIG. 8;

FIG. 10 is a rear view of a second embodiment of the chair base of my new design, as viewed from the left side of FIG. 8;

FIG. 11 is a top view of a second embodiment of the chair base of my new design; and,

FIG. 12 is a bottom view of a second embodiment of the chair base of my new design.

The chair base is adapted for supporting a chair. 

The ornamental design for a chair base, as shown and described. 